Length of one loop of B-DNA:

1. 3.4 nm.

2. 0.34 nm.

3. 20 nm.

4. 10 nm

Subtopic:  DNA Double Helix |
 82%
Level 1: 80%+
AIPMT - 2000
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Which of the following is correct about H-bonding in nucleotide:
1.  A–T G–C
2.  A–G T–C
3.  G–T A–C
4.  A–A T–T

Subtopic:  DNA Double Helix |
 96%
Level 1: 80%+
AIPMT - 2001
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If the DNA percentage of thymine is 20%, then what is the percentage of guanine?

1. 20% 2. 40%
3. 30% 4. 60%

Subtopic:  DNA Double Helix |
 88%
Level 1: 80%+
AIPMT - 2002
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Chargaff's rule states that in an organism:

1. The amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C).
2. The amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C).
3. The amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G).
4. Amounts of all bases are equal.

Subtopic:  DNA Double Helix |
 90%
Level 1: 80%+
AIPMT - 2003
Hints

During transcription, if the nucleotide sequence of the DNA strand that is being coded is ATACG, then the nucleotide sequence in the mRNA would be:

1. TCTGG

2. UAUGC

3. UATGC

4. TATGC

Subtopic:  The DNA | DNA Double Helix |
 84%
Level 1: 80%+
AIPMT - 2004
Hints

The following ratio is generally constant for a given species:

1. T + C / G + A 2. G + C / A+ T
3. A + C / T + G 4. A + G / C +T
Subtopic:  DNA Double Helix |
 52%
Level 3: 35%-60%
AIPMT - 2004
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